Source

---- Table `used_quota`. Used for Dovecot to store realtime quota.---- WARNING:-- - Works only with Dovecot 1.2+.-- - This table is not required in MySQL backend.--CREATETABLEIFNOTEXISTS`used_quota`(`username`VARCHAR(255)NOTNULL,`bytes`BIGINTNOTNULLDEFAULT0,`messages`BIGINTNOTNULLDEFAULT0,PRIMARYKEY(`username`))ENGINE=InnoDBDEFAULTCHARSET=utf8;